com.facebook.presto.jdbc.internal.apache.http.protocol.RequestExpectContinue Maven / Gradle / Ivy
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package com.facebook.presto.jdbc.internal.apache.http.protocol;
import java.io.IOException;
import com.facebook.presto.jdbc.internal.apache.http.HttpEntity;
import com.facebook.presto.jdbc.internal.apache.http.HttpEntityEnclosingRequest;
import com.facebook.presto.jdbc.internal.apache.http.HttpException;
import com.facebook.presto.jdbc.internal.apache.http.HttpRequest;
import com.facebook.presto.jdbc.internal.apache.http.HttpRequestInterceptor;
import com.facebook.presto.jdbc.internal.apache.http.HttpVersion;
import com.facebook.presto.jdbc.internal.apache.http.ProtocolVersion;
import com.facebook.presto.jdbc.internal.apache.http.annotation.ThreadingBehavior;
import com.facebook.presto.jdbc.internal.apache.http.annotation.Contract;
import com.facebook.presto.jdbc.internal.apache.http.params.CoreProtocolPNames;
import com.facebook.presto.jdbc.internal.apache.http.util.Args;
/**
* RequestExpectContinue is responsible for enabling the 'expect-continue'
* handshake by adding {@code Expect} header. This interceptor is
* recommended for client side protocol processors.
*
* @since 4.0
*/
@Contract(threading = ThreadingBehavior.IMMUTABLE)
@SuppressWarnings("deprecation")
public class RequestExpectContinue implements HttpRequestInterceptor {
private final boolean activeByDefault;
/**
* @deprecated (4.3) use {@link com.facebook.presto.jdbc.internal.apache.http.protocol.RequestExpectContinue#RequestExpectContinue(boolean)}
*/
@Deprecated
public RequestExpectContinue() {
this(false);
}
/**
* @since 4.3
*/
public RequestExpectContinue(final boolean activeByDefault) {
super();
this.activeByDefault = activeByDefault;
}
@Override
public void process(final HttpRequest request, final HttpContext context)
throws HttpException, IOException {
Args.notNull(request, "HTTP request");
if (!request.containsHeader(HTTP.EXPECT_DIRECTIVE)) {
if (request instanceof HttpEntityEnclosingRequest) {
final ProtocolVersion ver = request.getRequestLine().getProtocolVersion();
final HttpEntity entity = ((HttpEntityEnclosingRequest)request).getEntity();
// Do not send the expect header if request body is known to be empty
if (entity != null
&& entity.getContentLength() != 0 && !ver.lessEquals(HttpVersion.HTTP_1_0)) {
final boolean active = request.getParams().getBooleanParameter(
CoreProtocolPNames.USE_EXPECT_CONTINUE, this.activeByDefault);
if (active) {
request.addHeader(HTTP.EXPECT_DIRECTIVE, HTTP.EXPECT_CONTINUE);
}
}
}
}
}
}
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